As soon as I noticed the green line, I knew I had to visit a Samsung service center. Upon arrival, the staff examined my Galaxy S21 FE and confirmed that the display had a legitimate issue.

Reddit user kingshukroy01 (spotted by Sammobile) stuck to One UI 6 on their Samsung Galaxy S21 FE for fear of getting a green line when they apply the impending One UI 6.1 update. Note that this ...

As soon as I noticed the green line, I knew I had to visit a Samsung service center. Upon arrival, the staff examined my Galaxy S21 FE and confirmed that the display had a legitimate issue.